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In theory, there is no branch in the American constitutional system that exists above or beyond the reach of the others.
"The great security against a gradual concentration of the several powers in the same department consists in giving to those who administer each department the necessary constitutional means and personal motives to resist encroachments of the others," James Madison observed in Federalist No. 51.
Recently, Justice Samuel Alito gave a slightly different account of the relationship between the "departments" of government, at least as it relates to the relative power of the Supreme Court.
"Congress did not create the Supreme Court," Alito said in an interview with writers from the Wall Street Journal's editorial page. "I know this is a controversial view, but I'm willing to say it," Alito continued. "No provision in the Constitution gives them the authority to regulate the Supreme Court — period."
Alito was responding to a question about the prospect of ethics rules for the court. And he's probably right that Congress has no authority to micromanage the conduct of individual justices. The legislature can't force the justices to use one interpretive method over another or promulgate rules on how they reason through particular cases and decide them.
But Alito's claim is much bigger than a narrow point about the overall independence of the court; it is a categorical statement of judicial supremacy that also stands as a glimpse into the arrogance of one justice on a court that falsely sees itself as the only and final authority on what the Constitution means.